I totally agree with Kottke — you should always display a screenshot of your software.

Nethack description:

NetHack is a single player dungeon exploration game that runs on a wide variety of computer systems.

Nethack screenshot.

Bloglines description:

Bloglines is a free service that makes it easy to keep up with your favorite blogs and newsfeeds. With Bloglines, you can subscribe to the RSS feeds of your favorite blogs, and Bloglines will monitor updates to those sites. You can read the latest entries easily within Bloglines.

Bloglines screenshot.

IPython description:

An enhanced Interactive Python shell

IPython screenshots.

If a screenshot provides valuable information about those text-based applications, consider how much it could convey about yours.

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